using System;

namespace test
{
    class Program
    {
        static void Main(string[] args)
        {
            var notice = new NoticeWhat();

            // 通过匿名函数添加通知事件
            notice.AddObserver(() =>
            {
                Console.WriteLine("小明你妈妈回来了，赶快回家");
            });

            notice.AddObserver(Eat);

            notice.Notice();

            Console.ReadKey();
        }

        static void Eat()
        {
            Console.WriteLine("饭快凉了，赶紧吃饭。小心棍子！！！");
        }
    }

    public class NoticeWhat
    {
        // 通过泛型委托定义一个事件
        private event Action actions;

        public void Notice()
        {
            actions();
        }
        
        /// <summary>
        /// 添加通知事件
        /// </summary>
        /// <param name="runner"></param>
        public void AddObserver(Action runner)
        {
            actions += runner;
        }

        /// <summary>
        /// 删除通知事件
        /// </summary>
        /// <param name="runner"></param>
        public void RemoveObserver(Action runner)
        {
            actions -= runner;
        }
    }
}